Cannabis sativa L.,a plant of the Moraceae family,is domesticated by ancient ancestors and has become one of the most important crops in traditional Chinese agricultural production,but has since undergone a period of decline.This paper explores the decline of cannabis as a fibre crop,and the reduction in the value of cannabis cloth as a taxable product,as the main indicators of the decline of the cannabis crop.The paper argues that the Yuan Dynasty was a major turning point in the decline of the cannabis crop.This transition was the result of a combination of natural attributes and social factors,with policy factors playing a dominant role.From the Yuan to the Qing Dynasty,the cannabis crop was no longer used as a major source of clothing,but it still played a role in people's lives.The decline of the cannabis crop led to a restructuring of agriculture,and the combination of grain and cotton become the dominant agricultural cropping structure and continues today.
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